The act of taking an Alli or other diet pill, going out and eating a meal with a high fat content (which anyone who has taken an Alli knows this gives you the instant runs) and then emptying your runny bowels in the toilet tank instead of the bowl. Usually an act of revenge.

That fag Keith has stood me up for breakfast two weeks in a row. I'm going to pick up some Alli and Upper Deck Salad Shooter his downstairs bathroom.